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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 4, Iss. 1 — Jan. 1, 1920
  • pp: 24–33

Optics InfoBase > JOSA > Volume 4 > Issue 1 > A NEW MICROPHOTOMETER FOR PHOTOGRAPHIC DENSITIES.

A NEW MICROPHOTOMETER FOR PHOTOGRAPHIC DENSITIES.

W. F. MEGGERS and PAUL D. FOOTE.

JOSA, Vol. 4, Issue 1, pp. 24-33 (1920)
http://dx.doi.org/10.1364/JOSA.4.000024


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Citation
W. F. MEGGERS and PAUL D. FOOTE., "A NEW MICROPHOTOMETER FOR PHOTOGRAPHIC DENSITIES.," J. Opt. Soc. Am. 4, 24-33 (1920)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-4-1-24


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References

  1. Zeitschr. f. Inst, 19, p. 97, 1899.
  2. Ann. de Phys. (4) 39, p. 705, 1912.
  3. J. de Phys. (5) 9, p. 37, 1919.
  4. Bull. Bureau of Standards, 9, p. 475, 1913.
  5. Bull. Bur. of Stand. 12, p. 483, 1915.
  6. It is readily possible, often advisable and sometimes the practise of spectroscopists, to use more than 10 degrees of opacity in estimating intensities of spectral lines. The average spectrogram perhaps does not give a density of more than 2 for the strongest line on the plate, and this suggests that the upper limit of the scale of estimated intensities might conveniently be extended to 20, or even to 200. Then a larger number of steps would be available in a finer discrimination of opacities, and if the estimates follow Fechner's law, the factor 10 or 100 will readily permit a rough, but often sufficiently precise, transformation from visually estimated intensities to photographic densities.
  7. Hurter and Driffield: Jour. Soc. Chem. Ind., May, 1890, p. 455.
  8. Absorption and diffusion of light in the developed photographic plate have been studied by Callier, who also presents some of the photographic consequences of the scattering of light. Zeitschr. f. Wiss. Phot. 7, p. 257, 1909.

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